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  Method and device for producing sheet-like body and method for producing disposable absorbent article using the sheet-like bodyUSPTO Application #: 20060278335Title: Method and device for producing sheet-like body and method for producing disposable absorbent article using the sheet-like body Abstract: A method for manufacturing a sheet-shaped body 1 in which a powder particle layer 12 is sandwiched between a base sheet 10 to which a bonding agent is applied and a covering sheet 11 so as to be bonded into an integral body, is provided with the steps of: shifting the base sheet 10, the powder particle layer 12 and the covering sheet 11, with each of the sheets and the layer being held on the respective roller face, and after the powder particle layer 12 has been transferred onto the base sheet 10, bonding the base sheet 10, the powder particle layer 12 and the covering sheet 11 into an integral form. Thus, the powder particle layer can be fixed to a predetermined position in a stable manner. (end of abstract) Agent: Jordan And Hamburg LLP - New York, NY, US Inventors: Osamu Moriura, Kazuya Maruhata USPTO Applicaton #: 20060278335 - Class: 156279000 (USPTO) The Patent Description & Claims data below is from USPTO Patent Application 20060278335. Brief Patent Description - Full Patent Description - Patent Application Claims
TECHNICAL FIELD [0001] This invention relates to a method and a device for manufacturing a sheet-shaped body, and a method for manufacturing a disposable absorbent article using the sheet-shaped body. BACKGROUND ART [0002] Conventionally, a device, which manufactures a sheet-shaped absorbent body in which a highly absorbent resin particle layer is sandwiched between a base sheet to which a bonding agent is applied and a covering sheet so as to be bonded into an integral body, has been proposed (for example, see International Application Laid-Open WO01/89439). [0003] In addition, a continuous manufacturing method of a shorts-type disposable diaper has also been proposed (for example, Japanese Patent Application Laid-Open No. 2002-345883). [0004] In the Patent Document 1, highly absorbent resin particles are naturally dropped onto the base sheet to which an adhesive has been applied to be formed into a layer, and the base sheet, the highly absorbent resin particle layer and the covering sheet are bonded into an integral form so that a sheet-shaped absorbent body is manufactured. [0005] However, there has been such a problem that, when naturally dropping the highly absorbent resin particles, the highly absorbent resin particles bounce on the base sheet, and it becomes difficult to obtain a sheet-shaped absorbent body in which the highly absorbent resin particle layer is stably fixed onto a predetermined position. [0006] The present invention has been made in order to solve the above-mentioned problem, and its objective is to provide a method and a device for manufacturing a sheet-shaped body that is capable of stably fixing a powder particle layer at a predetermined position, and a manufacturing method of a disposable absorbent article using the sheet-shaped body. DISCLOSURE OF THE INVENTION [0007] In order to solve the above-mentioned problem, the present invention relates to a method that manufactures a sheet-shaped body in which a powder particle layer is sandwiched between a base sheet to which a bonding agent is applied and a covering sheet so as to be bonded into an integral body, is provided with the steps of: [0008] shifting the base sheet, the powder particle layer and the covering sheet, with each of the sheets and the layer being held on the respective roller faces, and after the powder particle layer has been transferred onto the base sheet, bonding the base sheet, the powder particle layer and the covering sheet into an integral form. [0009] In accordance with this invention, since the powder particle layer is transferred onto the base sheet while being shifted in the held state on the respective roller faces, it is possible to prevent the powder particles from bouncing, which makes this method different from the system in which powder particles are allowed to naturally drop to form a layer; therefore, it becomes possible to prepare the sheet-shaped body in which the powder particle layer is stably fixed onto a predetermined position. [0010] In addition, since the base sheet, the powder particle layer and the covering sheet are bonded into an integral form while being shifted, with each of the sheets and the layer being held on the respective roller faces, it is possible to easily control the shifting speeds and the bonding processes of the respective materials, and also to carry out the processes even in a narrow space. Therefore, in the case when the powder particle layer is prepared as a highly absorbent resin particle layer, the manufacturing method of a sheet-shaped body is easily assembled into a continuous manufacturing line of a disposal absorbent article. BRIEF DESCRIPTION OF THE DRAWINGS [0011] FIG. 1 is a system diagram that shows a manufacturing apparatus of a disposable absorbent article in which a manufacturing device of a sheet-shaped absorbent body is assembled. [0012] FIG. 2(a) is a side view showing the manufacturing device of a sheet-shaped absorbent body and FIG. 2(b) is a side view showing an essential portion of the manufacturing device of a sheet-shaped absorbent body having a protective plate member. [0013] FIG. 3(a) is a front view that shows a temporary receiving roller; FIG. 3(b) is an enlarged side sectional view that shows an essential portion of the temporary receiving roller; FIG. 3(c) is a plan view that shows a base sheet immediately after a highly absorbent resin particle layer has been transferred thereon; FIG. 3(d) is a side view of FIG. 3(c); FIG. 3(e) is a plan view that shows the base sheet immediately after the highly absorbent resin particle layer has been linearly aligned; and FIG. 3(f) is a side view of FIG. 3(e). [0014] FIGS. 4(a) to 4(h) are plan views of base sheets on which highly absorbent resin particle layers having patterns of respective types have been transferred. [0015] FIGS. 5(a) and 5(b) show a sheet-shaped absorbent body; FIG. 5(a) is a plan view; and FIG. 5(b) is an enlarged sectional view taken along line D-D of FIG. 5(a). [0016] FIGS. 6(a) and 6(b) show a disposable absorbent article; FIG. 6(a) is a plan view; and FIG. 6(b) is an enlarged sectional view taken along line E-E of FIG. 6(a). [0017] FIG. 7(a) is a side view of a manufacturing device of a sheet-shaped absorbent body constituted by a plurality of layers, and FIG. 7(b) is a sectional view showing the sheet-shaped absorbent body constituted by a plurality of layers. BEST MODE FOR CARRYING OUT THE INVENTION [0018] The invention relates to a manufacturing method of a sheet-shaped body which includes the step of transferring the powder particle layer onto the base sheet, with the powder particle layer being shifted in the same direction as the base sheet. In accordance with the invention, since the powder particle layer is transferred onto the base sheet while being shifted in the same direction as the base sheet, it becomes possible to smoothly transfer the powder particle layer, with the powder particle layer being kept free from bouncing. [0019] The invention relates to a manufacturing method of a sheet-shaped body which is designed so that the shifting speeds of the base sheet, the powder particle layer and the covering sheet are set to the same speed or the shifting speed of the powder particle layer is made slower. In accordance with the invention, since the base sheet, the powder particle layer and the covering sheet are shifted at the same speed or since the powder particle layer is shifted at a slower speed; therefore, it becomes difficult for the powder particle layer to flow at the same speed so that the sheet-shaped body in which the powder particle layer is stably fixed at a predetermined position can be obtained. Continue reading... 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